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<head>
  <meta charset="UTF-8">
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  <title>Document</title>
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  <script>
    function year(y){
      var result = "";
      if((y%4==0&&y%100!=0)||y%400==0){
        result = "闰年"
      }else{
        result = "平年"
      }
      return result
    }
    console.log(year(2012));
  </script>
</body>
</html>